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首页> 外文期刊>International Journal of Heat and Mass Transfer >An investigation on convective heat transfer performance around piezoelectric fan vibration envelope in a forced channel flow
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An investigation on convective heat transfer performance around piezoelectric fan vibration envelope in a forced channel flow

机译：强迫风道中压电风扇振动包络对流换热性能的研究

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摘要

An experimental and numerical investigation is performed in the current study to further explore the convective heat transfer performance by a vertically-oriented piezoelectric fan in the presence of channel flow. The effects of velocity ratio and fan tip-to-heated surface clearance are taken into considerations. It is illustrated that the presence of channel flow has an innegligible influence on the vibration amplitudes of the piezoelectric fan under large channel flow velocities. In the presence of channel flow, the vortical structures at the edges of vibrating fan are certainly suppressed, especially under large velocity ratios. On the other hand, the vortical streaming flow mixes with the channel flow to form a long stripe of vortical structure downstream of the fan vibration envelope. Under small velocity ratios, the impingement role of streaming flow along fan tip is still dominated and simultaneously the channel flow passing through the vibration envelope is effectively pulsated. Therefore, combined flows generally produce heat transfer enhancement around the fan vibration envelope related to the pure vibrating fan, especially at a small non-dimensional tip-to-surface gap. While under large velocity ratios, the impingement role of streaming flow induced by a vibrating fan is seriously weakened by the strong channel flow. The convective heat transfer produced by combined flows in the fan vibration envelope is generally reduced in comparison with pure piezoelectric fan. Related to the pure channel flow, the combined flows effectively improve the convective heat transfer, especially downstream of the fan vibration envelope. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在当前的研究中进行了实验和数值研究，以进一步探索在通道流动存在的情况下垂直定向压电风扇对流换热性能。速度比和风扇尖端与加热表面的间隙的影响已被考虑在内。可以看出，在大的通道流速下，通道流动的存在对压电风扇的振动幅度的影响微不足道。在存在通道流的情况下，尤其是在大速比下，振动风扇边缘的涡旋结构肯定会受到抑制。另一方面，涡流流与通道流混合，在风扇振动包络线的下游形成长条状的涡流结构。在较小的速比下，沿风扇尖端的气流的冲击作用仍然占主导地位，同时穿过振动包络线的通道流也被有效地脉动。因此，结合流通常会在与纯振动风扇有关的风扇振动包络周围产生传热增强，尤其是在较小的从顶部到表面的无尺寸间隙处。在大速比下，由于强劲的通道气流，严重削弱了由振动风扇引起的气流的冲击作用。与纯压电风扇相比，风扇振动包络中的混合流产生的对流传热通常会减少。与纯通道流相关，合并的流有效地改善了对流传热，尤其是在风扇振动包络线的下游。 （C）2018 Elsevier Ltd.保留所有权利。

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